{
  "manageEntity": {
    "action": "Save",
    "entityId": "875000355",
    "entityType": "Track",
    "nonce": "0x704812ad8c39baa25cddcadae4399633d136da1c4edb02020abbe0ef15e1a918",
    "signature": "0xb1389acfe927c8748e85c9f7e1a8b58b51e44e9b1634c255be3b5dc1c4a06ba5554881e3ac7e452e9e0b6bd61faeb5930d4f014704bde29d95d92c49331fedac1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}